She was nede woman who was priestess of Arkay during an ancient Era. She was raped by Molag Bal and left for dead, group of nomad found her tried to help the barely living woman, when she woke up she rampaged slaughtered the group like rapid animals, she was a monster, she was the very first vampire. She prayed for Arkay to cure her current state, she not get answer neither a cure. She got abadoned by Arkay. She get angered by that started spread vampirism, built a group a cult around her, centered by the hatred both Arkay and Molag Bal. Woman name Became Lamae Bal, the first vampire, the mother all vampire.
I based the cosplay on Lamae Bal lore-wise looking. She had no visible feature wich tells her vampiric nature.
Enjoy the cosplay.